extraterrestrial life

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extraterrestrial life

(eks-tră-tĕ-ress -tree-ăl) See exobiology; SETI.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
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Shostak cautioned that sightings of unidentified objects, which military pilots have been reporting for decades, could have a more earthly explanation than activity by an extraterrestrial civilization. "If they are here, if they are sailing the skies, you have got to say they are really great house guests," Shostak said.
Critique: Writer and photojournalist Will Hart provides compelling evidence that life on Earth could be due to the deliberate intervention of an extraterrestrial civilization. Regardless of whether one agrees with each point of contention (from interpreting the Great Pyramid of Giza as an alien message in stone, to harshly criticizing the "out of Africa" theory of evolution), Ancient Alien Ancestors is fascinating and thought-provoking when pondered as a whole.
Those two novels told of humanity's first encounter with an extraterrestrial civilization: the inhabitants of the planet Trisolaris in the Alpha Centauri star system.
A direct sequel to the Hugo Award-winning A Fire Upon the Deep, Vinge's 1992 novel that previewed the Singularity, his new book tells of an emerging extraterrestrial civilization forced to rush through the phases of technological development in the hope of defending against a godlike, superintelligent alien threat.
SETI scientists hypothesize that any extraterrestrial civilization will probably be some 200 to 1,000 light-years away, meaning that the simplest of dialogues would take centuries.
Understanding the mental states and subjective experiences of extraterrestrials is relevant to detecting, deciphering, and interpreting any message from an extraterrestrial civilization. Given current scientific understanding and technical ability, the fastest and the cheapest method for communicating across interstellar distances is to transmit a signal using electromagnetic radiation (e.g., radio waves), and it is generally assumed that any extraterrestrial civilization near our level of scientific understanding and technological ability would be similarly limited.
They argue that FRBs may be the result of "leakage" from planet-sized transmitters built by an extraterrestrial civilization to accelerate interstellar probes.
If the first extraterrestrial civilization we encounter is at the upper end of that age continuum, SETI scientists will be lucky to even recognize its artifacts as manifestations of intelligence, let alone interpret them.
The closest it can come is to venture the speculation that the discovery of an extraterrestrial civilization might result in an exchange of knowledge that could greatly enhance our own science and technology.
The scientists analyzed 2.5 million stars and found that 234 of them produced signals consistent with an extraterrestrial civilization trying to make contact.

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